Knife-blade switch



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UNITED STATES PATENT OFFICE.

WLLIAII I-I. SIEMON, OF WILKINSBRG, PENNSYLVANIA, ASSIGNOR TO WESTING-HOUSE ELECTRIC t MANFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.j

KNIFE-BLADE SWITCH.

Application filed October 4, 1922. Serial No. 592,252.

My invention relates to knife-blade switches and particularly to theblades thereof and the method of making the same.

Ny invention has for its object the provision of a knife-blade switchthat may be manufactured at a low cost and which is of substantialconstruction and also to provide a blade of such form that the handlemay befreadily attached thereto.

Another object of my invention is to provide an improved method ofmaking switch blades and similar devices.

I accomplish the foregoing objects by providing a bar of copper, orother suitable metal, having a slot at one end thereof, inserting amember of substantially conical shape in the slot, and securing the twotogether. The inserted member, being provided with a threaded opening,forms a screw seat for attaching a handle to the blade.

I-Ieretofore, in the construction of switch blades, the metallic bar hasbeen subjected to upsetting and drawing processes. Such operations havea tendency to crystallize `and weaken the metal in the blade. blade, themetallic bar is subjected only to In my a punching process, whichproduces no deleterious effect upon the remaining metal of the blade.

Figure l is a perspective view of t-he inserted member.

Fig. 2 is a perspective view of the blade member.

Fig. 3 is a side view of the assembled knife-blade member.

In the several views, similar reference characters indicate like parts.

A bar of suitable conducting metal 1, such as copper', is provided atone end with a slot 2, preferably formed by a punching process. Anopening 3 is provided adjacent to the opposite end for the reception ofa pivot pin, or other securing lmeans (not shown).

A second metallic member l is provided, having a body portion somewhatgreater in width than blade l. The surface of this member is providedwith oppositely arranged slots 5, and a threaded opening 6 is providedat one end. Preferably, member 4L is of a somewhat conical, or acorn,shape, although any desired form of shape may be employed. The slots 5are parallel with each other, as is shown in Fig. 3.

In assembling the switch blade, themember 4 is placed in the slot 2,whereupon the edges of the slot 2 seat themselves in vthe slots 5. Themembers l and 4; may then be secured by any suitable means, such as bycrimping, welding or soldering.

A knob or handle 7 is then secured to the blade by means of a screw 8,seated in the Vthread-ed opening 6. By having member 4' of a conicalform, the forces exerted by the screw 8 upon the member Ll are evenlydistributed throughout the latter to the blade member' l. A relativelysmooth surface is also provided, making a neat appearing and ruggedVconstruction.

It will thusbe seen that I have provided a two-part switch blade whichis simple of manufacture,r and which has the required strength, witghfaminimum amount of material. I.

My deviceI is not limited in its ap lication to switch blades, andvarious mo ifications may be made therein without departing from the;`spirit and scope of the invention as defined in the accompanying claims.Y

I claim as my invention:

l. An electric switch member comprising a blade member having a slot atone' end, a conical slotted member seated in the slot of said blademember, a slot of the second member forming a seat for the adjacent edgeof the blade member.

2. An electric switch member comprising a blade member having a slot atone end, a conical slotted member seated in the slot of said blademember, a slot of the second member forming a seat for the adjacent edgeof the blade member, said second member being provided with a threadedopening, and a handle secured by a screw co-operating with said threadedopening.

In testimony whereof, I have hereunto subscribed my name this 28th dayof September 1922.

WILLIAM H. SIEMON.

